Questions about example sentences with, and the definition and usage of "Npo"

A: nothing per oral / nothing by mouth

A: 学生=student, 会社員 = Employee, 企業の社長 = The president of a company, 公務員= civil servant, NPOなど= NPO etc, 色んな職種の参加者がいて驚いた= I was surprised that they were a lot of people from multiple jobs.

A: I had an internship in human resources at an NPO (Non-Profit Organization).

A: × ...also, at NPO Healer Association, she accompanied with her spiritual master at England, U.A.E., Malaysia, and places in Japan to provide healing support to many people.
✓ ...also, at NPO Healer Association, she accompanied her spiritual master at England, U.A.E., Malaysia, and places in Japan to provide healing support to many people.

× Immediately after returning to Japan, she was offered a position by a private company as a communication coordinator for a Japanese-Oman joint venture in Oman, where Japanese expats provided technical support to local workers.
✓ Immediately after returning to Japan, she was offered a position by a private company as a communication coordinator for a Japanese-Oman joint venture in Oman. A venture where Japanese expats provided technical support to local workers.

One sentence seemed very long…but it was grammatically correct